1240421447 has 2 divisors, whose sum is σ = 1240421448. Its totient is φ = 1240421446.

The previous prime is 1240421419. The next prime is 1240421461. The reversal of 1240421447 is 7441240421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1240421447 - 2²² = 1236227143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240421477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620210723 + 620210724.

It is an arithmetic number, because the mean of its divisors is an integer number (620210724).

Almost surely, 2^1240421447 is an apocalyptic number.

1240421447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240421447 is an equidigital number, since it uses as much as digits as its factorization.

1240421447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 1240421447 is about 35219.6173602156. The cubic root of 1240421447 is about 1074.4587712173.

Adding to 1240421447 its reverse (7441240421), we get a palindrome (8681661868).

The spelling of 1240421447 in words is "one billion, two hundred forty million, four hundred twenty-one thousand, four hundred forty-seven".